Study on two-phase flow dynamics in steam injectors - II. High-pressure tests using scale-models

Analytical and experimental studies have been conducted on large-scale stea m injectors for a next-generation reactor. The steam injectors are simple, compact, passive steam jet pumps for a steam-injector-driven passive core i njection system (SI-PCIS) or steam-injector-driven primary loop recirculati on system (SI-PLR). In order to check the feasibility of such large-scale s team injectors we developed the separate-two-phase flow models installed in the PHOENICS Code, and scale-model tests were conducted for both SI-PCIS a nd SI-PLR. A 1/2 scale SI-PCIS model achieved a discharge pressure of almos t 8 MPa with 7 MPa steam and 0.4 MPa water, and a 1/5 scale SI-PLR model at tained a discharge pressure of 12.5 MPa with 3 MPa steam and 7 MPa water. B oth results are in good agreement with the analysis, confirming the feasibi lity of both systems. The systems will help to simplify the next generation of BWRs. (C) 2000 Elsevier Science S.A. All rights reserved.